function isMobile(mobile) {
    var mobileReg = /^1[3456789]\d{9}$/;

    return mobileReg.test(mobile)
}
function isPassword(pwd) {
    var pwdReg = /^[A-Za-z0-9]{6,20}$/;
    return pwdReg.test(pwd)
}
function isInteger(value) {
    var reg = /^[1-9]*[1-9][0-9]*$/;

    return reg.test(value)
}

function isPriceNumber(_keyword){  
    if(_keyword == "0" || _keyword == "0." || _keyword == "0.0" || _keyword == "0.00"){  
        _keyword = "0"; return true;  
    }else{  
        var index = _keyword.indexOf("0");  
        var length = _keyword.length;  
        if(index == 0 && length>1){/*0开头的数字串*/  
            var reg = /^[0]{1}[.]{1}[0-9]{1,2}$/;  
            if(!reg.test(_keyword)){  
                return false;  
            }else{  
                return true;  
            }  
        }else{/*非0开头的数字*/  
            var reg = /^[1-9]{1}[0-9]{0,10}[.]{0,1}[0-9]{0,2}$/;  
            if(!reg.test(_keyword)){  
                return false;  
            }else{  
                return true;  
            }  
        }             
        return false;  
    }  
}

function isDoubleNumber(_keyword){  
    if(_keyword == "0" || _keyword == "0." || _keyword == "0.0" || _keyword == "0.00"){  
        _keyword = "0"; return true;  
    }else{  
        var index = _keyword.indexOf("0");  
        var length = _keyword.length;  
        if(index == 0 && length>1){/*0开头的数字串*/  
            var reg = /^[0]{1}[.]{1}[0-9]{1,8}$/;  
            if(!reg.test(_keyword)){  
                return false;  
            }else{  
                return true;  
            }  
        }else{/*非0开头的数字*/  
            var reg = /^[1-9]{1}[0-9]{0,10}[.]{0,1}[0-9]{0,8}$/;  
            if(!reg.test(_keyword)){  
                return false;  
            }else{  
                return true;  
            }  
        }             
        return false;  
    }  
}

function isIDCard(code) {
    var city = { 11: "北京", 12: "天津", 13: "河北", 14: "山西", 15: "内蒙古", 21: "辽宁", 22: "吉林", 23: "黑龙江 ", 31: "上海", 32: "江苏", 33: "浙江", 34: "安徽", 35: "福建", 36: "江西", 37: "山东", 41: "河南", 42: "湖北 ", 43: "湖南", 44: "广东", 45: "广西", 46: "海南", 50: "重庆", 51: "四川", 52: "贵州", 53: "云南", 54: "西藏 ", 61: "陕西", 62: "甘肃", 63: "青海", 64: "宁夏", 65: "新疆", 71: "台湾", 81: "香港", 82: "澳门", 91: "国外 " };
    var tip = "";
    var pass = true;

    if (!code || !/^\d{6}(18|19|20)?\d{2}(0[1-9]|1[12])(0[1-9]|[12]\d|3[01])\d{3}(\d|X)$/i.test(code)) {
        tip = "身份证号格式错误";
        pass = false;
    }

    else if (!city[code.substr(0, 2)]) {
        tip = "地址编码错误";
        pass = false;
    }
    else {
        if (code.length == 18) {
            code = code.split('');
            var factor = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
            var parity = [1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2];
            var sum = 0;
            var ai = 0;
            var wi = 0;
            for (var i = 0; i < 17; i++) {
                ai = code[i];
                wi = factor[i];
                sum += ai * wi;
            }
            var last = parity[sum % 11];
            if (parity[sum % 11] != code[17]) {
                tip = "校验位错误";
                pass = false;
            }
        }
    }
    return pass;
}

function isUndefined(value) {
    return typeof(value) == "undefined";
}

function isEmptyObj(obj) {
    if (isUndefined(obj)) {
        return true;
    }

    if (obj == '') {
        return true
    }

    var objKeys = Object.keys(obj);
    return objKeys.length == 0;
}

module.exports = {
    isMobile: isMobile,
    isPassword: isPassword,
    isInteger: isInteger,
    isIDCard: isIDCard,
    isPriceNumber: isPriceNumber,
    isDoubleNumber:isDoubleNumber,
    isUndefined: isUndefined,
    isEmptyObj: isEmptyObj
}